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Magenta color toner, toner cartridge, and process cartridge and image forming apparatus using the magenta color toner
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A toner, magenta technology, applied in the field of magenta toner
Inactive Publication Date: 2006-07-26
RICOH KK
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However, JP-A 2003-231744 has no description on the low-temperature fixability, heat offset resistance, and high-temperature storability of the toner
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[0081] Toner Preparation
[0082] There is no particular limitation on the method of producing the toner used in the image forming apparatus of the present invention, and known production methods such as a kneading / pulverizing method and a polymerization method can be used. The kneading / crushing method usually involves the following steps:
[0083] (1) Mixing toner components such as binder resin, wax, colorant, charge control agent and other additives with a mixer;
[0084] (2) Knead the mixture with a kneader such as a hot roll and an extruder, and then cool it;
[0085] (3) pulverize the kneaded mixture with a pulverizer such as a jet mill; and
[0086] (4) The pulverized mixture is classified to prepare toner particles.
[0087] The toner particles thus prepared are then mixed with one or more of the above-mentioned particulate inorganic materials using a mixer such as SUPER MIXER or HENSCEL MIXER.
[0088] The toner thus prepared preferably has a weight-average part...
[0120] The flask was then placed on a mantle heater. Nitrogen gas was blown into the flask so that the inside of the flask was in an inertatmosphere, and then the components were heated at 220° C. in a nitrogenstream to synthesize a polyester resin. This reaction is performed until the obtained polyester resin has a predetermined softening point. Thus, polyester resin (a) was prepared.
[0121] It was confirmed that the obtained polyester resin (a) had a weight average molecular weight (Mw) of 14,600, an acid value of 2.7 mgKOH / g and a glass tran...
Embodiment 2
[0140] The preparation procedure was repeated for Toner (1), except that the magenta pigment was replaced by 5 parts of another magenta pigment (PIGMENTRED 184, ie, a mixture of PIGMENTRED 146 and PIGMENTRED 147). Thus, Toner (2) having a weight-average particle diameter of 6.8 μm was prepared.
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Abstract
A magenta color toner including toner particles including a binder resin including a polyester resin including an inorganic tin (II) compound; a colorant having one of naphthol compounds having one of specific formulae. A process cartridge in which includes a photoreceptor bearing an electrostatic latent image; and a developing device configured to develop the latent image with a developer including the magenta color toner to from a toner image on the photo receptor are unitized. An image forming apparatus including a photoreceptor; a charger configured to charge the photoreceptor; a light irradiator configured to irradiate the photoreceptor with imagewise light to form an electrostatic latent image; a developing device configured to develop the latent image with a developer including the magenta color toner to from a toner image on the photoreceptor; and a transfer device configured to transfer the toner image onto a receiving material.
Description
technical field [0001] The present invention relates to a magenta toner for developing electrostatic latent images formed by image forming methods such as electrophotography, electrostatic recording and electrostatic printing. Furthermore, the present invention also relates to a toner cartridge containing magenta toner, and a process cartridge and an image forming apparatus using the magenta toner. Background technique [0002] A developer is used to develop an electrostatic latent image formed on an image bearing member by methods such as electrophotography, electrostatic recording, electroprinting, etc., thereby forming a visible image (i.e., a toner image) on the image bearing member ( development process). Then, the toner image is transferred onto a receiving material such as a receiving paper, optionally via an intermediate transfer medium (transfer process). The toner image on the receiving material is then fixed on the receiving material (fixing process). [0003] ...
Claims
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